کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1660109 | 1008396 | 2009 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Formation and characterization of 1, 5-diphosphono-pentane films on polycrystalline zinc substrates Formation and characterization of 1, 5-diphosphono-pentane films on polycrystalline zinc substrates](/preview/png/1660109.png)
Investigation on time-dependent layer formation was performed on high purity polycrystalline zinc surface in reaction with aqueous solution of 1, 5-diphosphono-pentane (DPP) at room temperature. Film evolution was characterized by X-ray photoelectron spectroscopy, contact angle, atomic force microscopy, glow discharge optical emission spectroscopy and detailed infrared reflection absorption spectroscopy measurements. Development of a partly crystalline zinc-diphosphono-pentane conversion layer of increasing thickness with time was determined by consistent evaluation of the results. The formed layers turned the hydrophobic zinc surface to hydrophilic. The conversion-type interaction of diphosphonic acid compounds with the oxidized zinc surface resulting in zinc-diphosphonate salt was unambiguously justified by XPS and GD-OES analysis.The corrosion behaviour of the coated zinc substrate was studied using electrochemical impedance spectroscopy (EIS). The formed layers show significant protective effect in sodium-sulphate solutions. It was shown, that under the applied conditions, a 4 h treatment is necessary to obtain 75% protection efficiency after 4 h of immersion into the Na2SO4.
Journal: Surface and Coatings Technology - Volume 203, Issue 9, 25 January 2009, Pages 1182–1192